Internal micrometer gauge



Aug- 18, 1931; J, R. AULENBACK l1\,819,l4l

INTERNAL MICROMETER GAUGE Filed May 5, '1929 lwith.

Illllllll Patented Aug. 18, 1931 Toor. COMPANY, 4oie. WORCESTER, MASSACHUSETTS, A. coRronATIoN or MASSA- CHUSETTS y y kApplication filed May 3, 1929 :Serial 170.860,177.

rlhis invention relates to -an adjustable micrometer gauge lby which internal diameters may be accurately measured. f

It is the object of my invention to provid an improved constructionfor such internal gauges, by which `an improved and simplified gauge is made available for a wide variety of uses andin a form which is of great commercial utility. l Y i Two forms of the invention-are shown in the drawings inwhich Fig. 1 is a side elevation of one form of my improved gauge Fig. 2 is a longitudinal Sectional view thereof;

Fig. 3 is an end elevation, looking in the direction of the arrow 3 in Fig. 1; Y

Fig. 4 is a perspective view of one of the gauge bars;

Fig. 5 is a side elevation of an alternative form of bar;

Fig. 6 is a side elevation of a second form of my invention, and

Fig. 7 is a longitudinal Shown in Fig. 6.

Referring particularly to Figs. 1 to 5, I have shown an internal gauge comprising a Supporting member 10 having an enlarged cylindrical end portion 11 provided with a plurality of axially extended grooves or guideways 12. The grooves 12 extend the entire length of the enlarged cylindrical portion 11 of the member 10 and the bottom surfaces 13 of the grooves l2 are inclined downwardly and outwardly with respect to the longitudinal axis of the gauge. The supporting member 10 is also provided with a shank portion 15 of reduced diameter, extending axially within a handle 17.

The handle 17 is keyed to the shank portion 15 for rotation therewith and the handle and shank are threaded internally and externally respectively to receive a cap 20 having a doubly threaded flange 21 by which the handle and shank are firmly secured together, in ellect forming a single operating member.

A plunger 22 is slidably mounted in an axial opening in the supporting member 10 and at its outer end is provided with an enlarged head 24 which is undercut to receive section of the gauge beveled projections `member 1Q is 'axial recess 28 adapted to receive a spring 30, mounted on the Athereon by a nut Sltlireaded on the end of 'rotatably mounted on a the handlell7.'

INTERNAL yMItfJRMETER entren i the gaugeV bars 27. The shank portion of the supporting j provided with an lenlarged plunger 22 and retained the plungerz Theinner end-'of the spring engages a shoulder 33 inthe shank 15.

The -inner end portion 35 of the handle'l7 j is threaded externally to receive a sleeve 40 having corresponding internal threads and reduced portion of 40, as viewed inthe drawings, is undercut as indicated atf42'and engages beveled end surfaces 44 of the gauge bars 27'. f-

A shell or thimble 46 is rotatablymounted on they sleeve 40k and may be securedin'any desired position by affset screw 47, sieat'ingin an annular groove 48 inthe sleeve 40. The shell 46 is graduated, as. indicated in Fig. l, and theadjacentportion'ofthe handle 17 is also graduated. :L l` @-.Thi's form of:my'improved gaugeisv designed particularly for measuringy holes or openings4 which are relatively accessible and measurements mayi'be conveniently made by holding thelhandle 17 in thehand of the operator'and byfY turning the sleeve 40 by the thumb: and-:fore linger.k As the sleeve is r0- tated, itwill'besimultaneously moved axially in one direction or the other along the handle 17 and supporting `member `10, and .will cause corresponding `axial movement ofthe gauge barsl27f, slidingtliem up or down along the guideways 12. f .f f y :The sleeve 40 iis effective to movethe gauge loa'rsctoY the left, 'as viewed in. the drawings, and the spring plunger 22 returns the gauge barsto the,y right, holding .them `lirmlylseated againstthe,underctfend of the'sleeve 40. f .v By loosening the screw 47 ,the shel146 may be--setfto indicate, a zero .position afterthe y gauge has' been adjusted to anydesired size,

and the; graduations will l.thereai'ter indicate the dier'encein setting of the `gauge over or under the zero Vor initial diameter.v When Y,it .i's desired to gauge internal threads,.gaugeyhalfa0f the type .indcatedat 25 on the end Aportions of "JAMES ROY AAULENBiLi'cK,on' WORCESTER, MASSACIUSETTS.AS'SIGNOR vTo AUINBACK 5' The-left hand end of the sleeve A `form previously described. A plunger 22 and 49 in Fig. 5 may be substituted for the gauge bars 27, which are designed for cylindrical surfaces.

In Figs. 6 and 7, I have shown a form of my improved gauge more particularly adapted for the gauging of deeper holes or Openings.

In ,this construction, the supporting member 50 is provided with a cylindrical portion l1 having grooves or guide-ways 12 with inclined bottom surfaces 13, exactly as in the spring 30 are similarly mounted in the supporting member 5() and the plunger is provided with the enlarged head 24 engaging the ends of gauge bars 27, all as previously shown and described. y

The internal construction and method of adjustment .of the gauge is somewhat different, however, from the form previously de- Vthe inner sleeve 57 and is held romaxial movement by a cap 66 threaded on the end of the shank portion 56..

, Ifthe outer sleeve 60 is held from rotation and the handle 64 is turned, the inner sleeve v54C will be correspondingly rotated and relativelaxial movement of the outer sleeve 60 will be produced, thus changing the adjusts ment of the gauge bars 27. The sleevev 60 may be of any desiredlength sok that it may be inserted in relatively deep holes.

A graduated shell or thimble is mounted on the sleeve 60 and is adjustable thereon as previously described. A recessed portion 72 of the handle 64; is provided with circumferential graduations: and projects over the `graduated portion of the shell 70. The two sets of graduations cooperate to indicate the ing the outer ends of said gauge bars, said plunger being eiiective to yieldingly move said gauge bars endWise and outward in said guideways, a handle enclosing the extension of said supporting member and having an extended hub formed With external screwthreads at its end portion, the end of said support extension being externally threaded and the corresponding end of said handle being recessed and internally threaded, a cap for said handle having an internally and externally threaded annular la-nge fitting said recess and threaded in said support and handle, whereby said handle is iirmly mounted on said support extension and is held rom axial movement relative thereto, and aI sleeve threaded on the end portion o said hub and forming an adjustable stop engaging the inner ends of said gauge bars, axial movement of said sleeve relative to said supporting member and handle being effected by rotation of said sleeve on said threaded handle hub.

In testimony whereof I have hereunto affixed my signature.

JAMES ROY AULENBACK.

radial adjustment of the gauge bars 27, asin the form previously described.

I-Iaving describedmy invention andthe advantages thereof I do not wish to be limited to the details herein disclosed' otherwise than as set forth in the claims, but what I claim An internal micrometer gauge comprising a supporting member of circular cross section having ak plurality of axially extending guideways Vformed therein with bottom surfaces inclined 'to the axis of the gauge, said member havinga longitudinal bore andhaving an extension at one end, gauge bars slidably mounted in said guideways, a spring plungeraxially slidable-in said supporting member and having an enlarged end engag- IIa 

